What makes the 787 fuel efficient?

What makes the 787 fuel efficient?

This advanced approach eliminated 1,500 aluminium sheets and 40,000-50,000 fasteners per section, which makes the plane much lighter, more aerodynamically efficient and therefore more fuel efficient. The 787 is powered by new, more fuel efficient models of jet engines produced by General Electric and Rolls-Royce.

What is no-bleed system?

In the no-bleed architecture, electrically driven compressors provide the cabin pressurization function, with fresh air brought onboard via dedicated cabin air inlets.

Does the 787 have a hydraulic system?

In the 787 no-bleed architecture, the center hydraulic system is powered by two large (approximately 30 gpm at 5,000 psi) electric-motor-driven hydraulic pumps. One of the pumps runs throughout the entire flight and the other pump runs only during takeoff and landing.

Does the 787 have an APU?

Because the 787 uses more electricity than do other Boeing airplanes, the 787 generates more electricity, via six generators: two on each engine and two on the auxiliary power unit (APU, a small turbine engine in the tail).

What makes an aircraft fuel-efficient?

The fuel economy in aircraft is the measure of the transport energy efficiency of aircraft. Efficiency is increased with better aerodynamics and by reducing weight, and with improved engine BSFC and propulsive efficiency or TSFC.

How does bleeding air affect propulsion?

Although not commonly used on commercial aircraft, bleed air can be used to improve the aerodynamic flow characteristics over a wing or into an engine inlet. This system injects the high pressure air just before the leading edge of the wing flap, which delays the boundary layer separation.

How does air bleed system prevent surface tension?

Due to low pressure, the bubbles formed can boil and implode eroding and causing damage to nearby surfaces. To prevent this, the reservoirs are pressurized with bleed air to eradicate the presence of bubbles within the fluid.

How is the 787 fuselage construction?

Composite fuselage of the Boeing 787 Dreamliner: (a) the fuselage barrel is a continuous construction build on a rotating mandrel through automated tape laying [13]; (b) the resulting monocoque shell has internal longitudinal stiffeners already built in [12]; (c) the highly integrated internal structure of the fuselage …

How can aviation fuel efficiency be improved?

Reducing the overall weight of the airplane is always a top priority to increase fuel efficiency. Changes of memory alloy in different temperature and pressure.

Does bleed air affect performance?

This extraction of bleed air introduces a performance penalty on the engine. Bleed usually causes thrust to decrease, specific fuel consumption to increase, and engine turbine temperatures to increase. All of these parameters have a strong effect on aircraft performance.

What is the purpose of bleed air?

Bleed air can be used to heat the engine inlets to prevent ice from forming, detaching and being ingested into the engine. Similarly, this warm air can be used to prevent ice build-up on the leading edges of the wings. Bleed air is also sometimes used for starting one of the aircraft’s engines.

What is the significance of the air bleed?

In civil aircraft, bleed air’s primary use is to provide pressure for the aircraft cabin by supplying air to the environmental control system. Additionally, bleed air is used to keep critical parts of the plane (such as the wing leading edges) ice-free.

How do you start an airplane without APU?

Without an APU an aircraft would depend on GSE only for starting one engine with pressurized ground supplied air. Aircraft are allowed in general to fly without an APU. Exceptions are flights with two-engined aircraft and long routes over water or terrain without an alternate airport – so called ETOPS flights.

What is the 787 fuselage made of?

carbon fiber
Each Boeing 787 aircraft contains approximately 32,000 kg of CFRP composites, made with 23 tons of carbon fiber [11]. Composites are used on fuselage, wings, tail, doors, and interior. Boeing 787 fuselage sections are laid up on huge rotating mandrels (Figure 6a).

How does the Boeing 787 reduce fuel usage?

The new airplane’s use of electrical systems reduces fuel usage and increases operational efficiency. The primary differentiating factor in the systems architecture of the 787 is its emphasis on electrical systems, which replace most of the pneumatic systems found on traditional commercial airplanes.

What makes the Boeing 787 different from other planes?

The primary differentiating factor in the systems architecture of the 787 is its emphasis on electrical systems, which replace most of the pneumatic systems found on traditional commercial airplanes.

What is the Boeing 787’s no-bleed architecture?

The 787’s no-bleed systems architecture will allow the airplane’s engines to produce thrust more efficiently — all of the high-speed air produced by the engines goes to thrust. Pneumatic systems that divert high-speed air from the engines rob conventional airplanes of some thrust and increase the engine’s fuel consumption.

What are the advantages of a no-bleed electrical systems architecture?

One of the advantages of the no-bleed electrical systems architecture is the greater efficiency gained in terms of reduced fuel burn — the 787 systems architecture accounts for predicted fuel savings of about 3 percent.

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